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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | The following table summarizes stock option activity of the Company for the six months ended June 30, 2021:
| Total Number of Shares (In Thousands) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (In Years) |  | Aggregate Intrinsic Value (In Thousands)
Outstanding at December 31, 2020 | 208 |  |  | $ | 13.38 |  |  | 9.08 |  | $ | 733 |
Granted | 312 |  |  | 7.99 |  |  |  |  |
Outstanding at June 30, 2021 | 520 |  |  | $ | 10.14 |  |  | 9.25 |  | $ | 2,688 |
Options exercisable at June 30, 2021 | 90 |  |  | $ | 23.36 |  |  | 8.48 |  | $ | 695 |
Schedule of Allocated Stock-based Compensation Expense | The following table summarizes the components of stock-based compensation expense in the consolidated statements of operations for the three and six months ended June 30, 2021 and 2020, respectively (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Research and development | $ | 35 |  |  | $ | 4 |  |  | $ | 48 |  |  | $ | 5 |
General and administrative | 229 |  |  | 142 |  |  | 400 |  |  | 286 |
Total stock-based compensation | $ | 264 |  |  | $ | 146 |  |  | $ | 448 |  |  | $ | 291 |
Assumptions for Option Grants Issued | The Company uses the Black-Scholes option-pricing model to determine the fair value of all its stock options granted. The assumptions used during the three and six months ended June 30, 2021 and 2020, respectively, were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Risk free interest rate | 1.12 | % |  | 0.53 | % |  | 1.04 | % |  | 0.62 | %
Volatility | 121.47 | % |  | 108.08 | % |  | 121.23 | % |  | 106.24 | %
Expected lives (years) | 6.25 |  | 6.25 |  | 6.18 |  | 6.15
Expected dividend yield | — | % |  | — | % |  | — | % |  | — | %
Summary of RSU Activity | The following table summarizes RSU activity of the Company for the six months ended June 30, 2021:
| Shares (In Thousands) |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2020 | 170 |  |  | $ | 1.89 |
Granted | 40 |  |  | $ | 8.00 |
Vested | — |  |  | $ | — |
Unvested at June 30, 2021 | 210 |  |  | $ | 3.06 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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